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Bridge Specifications
Length of arch span: 503 metres
Height at top of arch: 134 metres above sea level
Height at top of aircraft beacon: 141 metres above sea level
Width of deck: 49 metres
Shipping clearance: 49 metres
Height of pylons: 89 metres above sea level
Pylon dimensions: 68 metres across, 48 metres long (two pylons rest on each abutment tower)
Total length of bridge: 1149 metres including approach spans
Size of bearing pins: 4.2 metres long, 368 millimetres in diameter
Thrust on bearings: 20,000 tonnes maximum load on each bearing
Number of rivets: (approx) 6,000,000
Largest rivet: 395 millimetres long, weighing 3.5 kilograms
Longest hanger: 58.8 metres
Shortest hanger: 7.3 metres
Total weight of steelworks: 52,800 tonnes including arch and mild steel approach spans
Weight of arch: 39,000 tonnes
Rock excavated for foundations: 122,000 cubic metres
Concrete used for bridge: 95,000 cubic metres
Granite used for bridge approaches: 17,000 cubic metres
Allowance for deck expansion: 420 millimetres
Allowance for arch expansion: 18 centimetres (due to heating or cooling)
Number of panels in arch: 28, each 18.28 metres wide
Record tonnage erected in one day: 589 tonnes of steelwork (26 November 1929)
Amount of paint: 272,000 litres (for initial three coats)
First sod turned: 28 July 1923
Arch joined: 19 August 1930
Official opening 19 March 1932
Tender price: £4,217,721 11s 10d
Tramtracks removed: 1959
Northern tramway approach removed for Warringah Expressway: 1966


Other significant steel arch bridges
No. Bridge Span Location Country Year
1 Lupu 550m Shanghai China 2003
2 New River Gorge 518m Fayetteville USA 1977
3 Bayonne 504m New York USA 1931
4 Sydney Harbour 503m Sydney Australia 1932
5 Chenab 461m Katra India 2007